Lamp stand



C. A. EGLJ LAMP STAND FiledMay 18, 1931 INVENTOR.

W LW 5 ATTORA 3 Patented June 28, 1932 CONSTANT ARMIN EGLI, F

LAMP

Application filed May 18,

This invention relates to lamp stands and has for an object to provide alamp stand with an adjustable lamp support; another object is to providea friction support for a lamp mounted on a stand or a pendant. Otherobjects of the invention will be understood from the followingspecification and the accompanying drawing, in which:

Fig. 1 is a side elevation of a lamp embodying my invention;

Fig. 2 is a detail, partly sectioned, of the lamp support shown in Fig.1;

Fig. 3 is a View showing the frictional engagement between the lampstand and the lamp support with the housing sectioned;

Fig. 4 is a sectional detail on line 44; of F i 3;

Fig. 5 is also a sectional detail on line 5-5 of Fig. 3;

Fig. 6 is a view of the frictional lamp sup port in another positionwith the housing shown in section;

Fig. 7 is a view, partly sectioned, of a pen lent lamp embodying myinvention and,

Fig. 8 is a sectional detail on line 88 of Fig. 7.

This invention is shown applied to electric lamp stands of the usualtype in which a stand supports an arm which carries the lamp and thelamp shade. It is often desirable to adjust the height of this arm andalso to leave it free to rotate on the lamp stand and the presentinvention includes a frictional engagement between the pedestal and thesupporting arm, whereby the arm may be read ily adjusted in elevation,and, at the same time, remain free to swing around the pedestal.

The form of frictional engagement between the supporting arm and thepedestal referred to, comprises a metallic hose, preferably made ofphosphor bronze wire and provided with a flange or collar at one end andsoldered or otherwise having the strands united in a solid ring at theopposite end. The hose between these two ends, when stretched, contractsin diameter and when compressed between these two ends expands indiameter. This principle of contraction and expansion of the hose isused to provide the frictional engagement PATENT GFFEQE WEEHLAWKEN', NEWJERSEY STAND 1931. Serial No. 538,218.

desired between the supporting arm and the pedestal of the lamp whichpasses through the hose. In practice a spring is provided to bring thehose back to its normal position and to make the device readilyadjustable from any position in either direction.

The frictional device referred to is enclosed in a suitable housingbetween two flanged collars which are attached to an off-set handle bymeans of which the adjustment can readily be made, and this handle isconstructed with a hollow interior to receive the electric conductor forthe lamp.

The arrangement described is also applicable to ceiling lights, in whichthe lamp shade is vertically adjustable to any height and which may besupported by a tube of square section so that the shade itself will notrotate.

Referring to the drawing, 11 is the base of the lamp stand 12 upon whichthe frictional member 13 is mounted and which connects through the topcollar 25 and the bottom collar 26 with the handle 14 and the horizontalsupporting arm 15 is secured to the top collar 25 and carries the lampand shade 16 as illustrated. The flexible electric conductor 17, asillustrated in Fig. 2, connects through the elbow 30, tube 33, elbow 31and through the annular groove in the top collar 25 as indicated at 51,Fig. 3, to the horizontal tube 15 and to the lamp.

The frictional member 13, as indicated in Figs. 3 and 6, includes thetubular housing 24 extending from the top collar 25 to the bottom collar26 which slides freely on the stem 12. The top and bottom collars areflanged as shown to engage the ends of tube 24. Upon the stem 12 andlocated within the housing 24 is the wire hose 21 which has the wirestrands at the lower end 22- soldered or brazed into a solid ring andwhich is provided with a collar 23 at the free end. The tube 24 hasfixed therein the collar 27 through which the stem 12 slides freely andupon this collar the coil spring 28 rests at its lower end while the topend engages the collar 23 secured to the hose 21.

WVhen the friction member 13 is raised the spring 28 acting against thecollar 23 tends to elongate the metallic hose 21 and thereby contractits diameter so that its friction against the stem 12 is somewhatincreased and'thus it resists movement, however, as the stem 12 issmooth and usually polished the friction member 13 can be moved againstthis friction, but the friction tends to retard initial movement. Whenthe friction member 13 is moved downwards the hose is contracted asindicated in Fig. 6 and the friction against the stem is therebysomewhat lessened, however, as soon as the movement of 13 ceases thehose 21 immediately resumes its normal length by reason of the strandsbeing held rigid at both ends and thus againthe normal friction tostabilize the bracket in the adjusted position is automaticallyrestored.

It will be observed, from Fig. 2, that this frictional apparatus isassembled on shoulders on the top collar 25 and the bottom collar 26which engage the outer tube or housing 24 and the top collar is formedintegral with the elbow 31 while the bottom collar is formed integralwith the elbow 30 and these elbows are screw connected at 34 by the tube33 which is enclosed by the handle 14. This provides a constructionwhich is readily assembled and taken apart and may be adjusted fordifferent lengths of housing. It will also be noted that the degree offriction to support the load on the bracket can be varied b varyingeither the length of the hose 21 or y varying the rigidity of the Wireof which the hose is made or both.

The construction in Fig. 7 shows a pendent lamp in which the tube 40 issecured to the ceiling and has enclosed therein in a spiral the electricconductor 41 which is led into the square tube 42. This tube is led outthrough the square aperture 43 at the end of tube 40 and supports thelamp shade 44. A collar 27 is provided in tube 40 to engage thefrictional mechanism, comprising the hose 21 which, in this case, issquare in section to correspond with the tube 42 and may be enclosed bya coil spring which is also square in section. The friction hoseoperates, in this case, similar to that shown in Figs. 3 and 6 andprovides a convenient means for raising and lowering the lamp shadewithout exposing loose wires and without the use of any balancing deviceto counter-balance the lamp shade. This invention is shown and describedin connection with lamp shades, but it should be understood that as anadjustable friction member it is of general use.

Having thus described my invention, I claim:

1. In combination, a lamp stand having a stem and a bracket supporting alamp, said bracket comprising a handle terminating in a pair of alignedcollars through which said stem passes and an arm secured to one of saidcollars, a metallic hose surrounding said stem, a coil springsurrounding said hose and engaging said hose at one end, a tubularhousing for said spring and hose placed between and held in position bysaid collars, said handle, one of said collars and said arm forming acontinuous conduit for an electric conductor associated with said lamp.

2. In combination, a lamp stand having a stem and a bracket supporting alamp, said bracket comprising a handle terminating in a pair of spacedaligned collars with flanges through which said stem passes freely, ahollow arm secured to one of said collars supporting a lamp socket, ametallic hose with a flange at one end surrounding said stem, a coilspring surrounding said hose and engaging said flange, a tubular housingfor said spring and hose having a collar engaging said spring, saidhousing placed between and held in position by the flanges of saidcollars, said handle and said arm forming a conduit for an electricconductor to said lamp socket.

In testimony whereof I aiiix my signature.

CONSTANT ABMIN EGLI.

